Implementation Of Uhf Rfid Installations; Preparation Phase - Siemens SIMATIC RF600 Series Configuration Manual

Appendix
A.1 Planning and installation of UHF read points
Linear antennas can only be used if the alignment of the transponder is defined. On the
other hand, one advantage of linear antennas is that they react less sensitively to reflections.
This restriction does not apply with circular polarization. Circular antennas can also be used
with differing alignments of the transponder and achieve constant results (e.g. RF680A or
RF685R). It has been shown that with a defined transponder alignment, the linear antenna
normally produces the best results.
A.1.2

Implementation of UHF RFID installations

The use of UHF RFID systems requires careful planning and preparation to avoid problems
during commissioning and operation.
A.1.2.1

Preparation phase

Device selection
Dynamic identification
Dead spots cannot be excluded. To be able to compensate for dead spots, we recommend
that you give preference to dynamic identification rather than static identification. Dynamic
identification means that the transponders are read while they are moving (e.g. on the
conveyor belt). If static identification is necessary, the antenna field can e virtually
dynamized with the RF685R antenna or RF680A.
Triggering
To read out all right transponder data, you can have the readers perform permanent
write/read actions or have specific write/read actions triggered. For the following reasons, we
recommend that you trigger specific write/read actions:
● The RFID system only performs write/read actions when an object to be identified enters
the antenna field. This reduces the number of process errors and they can be identified
more quickly.
● Due to the fact that the various RFID systems only perform write/read actions when
necessary, this reduces the possibility of antenna fields disrupting each other. This
increases process reliability in plants, particularly when there is a high reader density.
Decoupling third-party RFID systems
If you are using different RFID systems, make sure that no two systems are active at the
same time or operate separately from each other. Ideally there should be no mixed usage.
Training
Make sure that the engineers commissioning the UHF RFID systems are adequately trained.
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Configuration Manual, 11/2018, C79000-G8976-C386-07
SIMATIC RF600